213523543 has 4 divisors (see below), whose sum is σ = 213556720. Its totient is φ = 213490368.

The previous prime is 213523489. The next prime is 213523547. The reversal of 213523543 is 345325312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213523543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213523547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3483 + ... + 20956.

It is an arithmetic number, because the mean of its divisors is an integer number (53389180).

Almost surely, 2^213523543 is an apocalyptic number.

213523543 is a deficient number, since it is larger than the sum of its proper divisors (33177).

213523543 is an equidigital number, since it uses as much as digits as its factorization.

213523543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33176.

The product of its digits is 10800, while the sum is 28.

The square root of 213523543 is about 14612.4447988692. Note that the first 3 decimals coincide. The cubic root of 213523543 is about 597.6981648099.

Adding to 213523543 its reverse (345325312), we get a palindrome (558848855).

The spelling of 213523543 in words is "two hundred thirteen million, five hundred twenty-three thousand, five hundred forty-three".